Barriers to health promotion in community dwelling elders.

As the number of elders who live in the community increases, promoting their health and independence is a priority of nursing care. As suggested in the Health Promotion Model, barriers can impede the practice of health promotionn. In this descriptive correlational study, community-dwelling elders 65 and older were recruited (N=141) to examine the relationship between attentional demands as measured by the Attentional Demands Survey and health promotion.

Intersubunit interactions associated with Tyr42 alpha stabilize the quaternary-T tetramer but are not major quaternary constraints in deoxyhemoglobin.

Previous mutational studies on Tyr42alpha variants as well as the current studies on the mutant hemoglobin alphaY42A show that the intersubunit interactions associated with Tyr42alpha significantly stabilize the alpha1beta2 interface of the quaternary-T deoxyhemoglobin tetramer. However, crystallographic studies, UV and visible resonance Raman spectroscopy, CO combination kinetic measurements, and oxygen binding measurements on alphaY42A show that the intersubunit interactions formed by Tyr42alpha have only a modest influence on the structural properties and ligand affinity of the deoxyhemoglobin tetramer. Therefore, the alpha1beta2 interface interactions associated with Tyr42alpha do not contribute significantly to the quaternary constraints that are responsible for the low oxygen affinity of deoxyhemoglobin.

Effects of age, step direction, and reaction condition on the ability to step quickly.

Background: The ability to take a step quickly is important for balance maintenance during activities of daily living. The purpose of this study was to investigate the effects of age, reaction condition, and step direction on the ability to take a volitional step as fast as possible.

Methods: The performance of a voluntary step task was measured in young adult (mean age 20, SD 0.